just to save you some time you can only find the key after picking up the note
Viewing post in Solitude: The last human jam comments
Well, after trying to find a key for 20 minutes, I accidentally found a flashlight when frantically clicking here and there. And then I died (on purpose) to start again only to see that the flashlight is not actually there, but you get it anyway if you click (or did I miss it, the actual object render) I do not know. If the key is like that as well, I am not sure I have any luck finding it. And after another 10-15 minutes the flashlight battery just died! :-D Nice detail. But no key. I even tried following the god ray into the killing water.